Drying roll for paper-making machinery



H. H. VAUGHAN.

DRYING ROLL FOR PAPER MAKING MACHINERY.

APPLICATION FILED APR. 3. 1920.

Patented @et 311, 1922.,

Patented @et si, Tear,

naman sTaTes PATENT ciertos;

DRYING ROLL FOR PAPER-MAKING MACHINERY.

Application tiled April 3, 1920. Seri-a1 It'o. 371,060.

To all 'whom t may camera.'

Be it known that I, HENRY H. VAUGHAN, a subject of the King of GreatBritain, and resident of the city of Montreal, in the Province of Quebecand Dominion of Canada,

have invented certain new and useful Im-l provements in Drying Rolls forPaper-Maklng Machinery; and I do hereby declare that the following is afull, clear, and exact description thereof.

1 My invention relates to machinery for the drying of paper and millboard in which the paper or mill board is carried around a number ofdrums heated by steam or other suitable means. Heretofore it has beenthe practice to feed the paper to the drums and hold the same inposition thereon by an endless belt usually of felt which in eectcarried the paper or mill board while retaining it against the dryingroll. vIhe object of my invention is to overcome the necessity of usinga belt or other carrying medium, while at the same time to provide anefficient means whereby the paper or mill board is retained in place andreleased as required.

Broadly stated my invention resides in a drying roll for paper, millboard andthe like, and consists in the substitution for the usual feltcarrier of a suction action taking place between the surface of contactbetween said paper, mill board and the like and the drying roll.

More specifically stated the invention consists of a perforated drum andmeans for causing suction through said erforations, said meansconsisting of a suction device, a valvular member connected to thesuction device and located within the drum and extending longitudinallyof the same, a second valvular member encircling the first mentionedmember and pipes effecting communication between lthe second member andthe perforations in/ the drum.

For full comprehension, however, of my inventionreference must be had tothe accompanying drawings in which similar reference characters indicatethe same parts and wherein:

Figure 1 is a side elevation partly in section of a drying rollconstructed according to my invention;

Figure 2 is a transverse sectional view taken on line 2-2 Figure 1;

Figure 3 is a transverse sectional View taken on line 3 3 Figure 1;

Figure 4 is a fragmentary longitudinal secional View taken on line 4-4Figure 3; an

Figure 5 is a detail sectional view of closure for the inner end of thevalvular pipes within the roll.

In carrying out my invention each drum consists preferably of a hollowcylindrical member 2 perforated throughout its length as at 3, theperforations belng arranged in circumferential series. The ends of thedrum are closed by covers 4 and 5 seated upon annular flanges formedintegrally with each end of the drum. I-lollow trunnions 6 and 7 formedintegrally with the covers 4 and 5 respectively, are journalled inbearings 8 carried in standards 9, the trunnion 6 being hollow for thepurpose of admitting the necessary piping (not shown) for supplyingsteam to the interior of the drum and for the exhaust of thecondensation water, while trunnion 7l accommodates piping constitut ingan element of the means for causing suction through the perforations forthe urpose of maintaining the paper in posltion upon the drum duringtravel around the same.

This last mentioned means consists of a suction device illustrateddiagrammatically at 90 which maconsist of a fan or any preferred means.o this suction deviceis connected by a pipe line 10 a valvular mechanismfor controlling the suction through the perforations. rI`his valvularmechanism consists of a stationary pipe 12 passin through trunnion 7 andcentrally of the rum to a point within close proximity of the cover 4,rotation and displacement of the pipe being prevented by a clamp 13encircling the pipe immediately before it enters the trunnion 7 suchclamp being carried by a bracket 14. Closely fitting over thisstationary valvular pipe with a snug sliding -fit is a second valvularpipe 15 which extends from the free innervend of the former to the innerface of the cover 5 to which it is rigidly fastened by screws 16. Thissecond pipe is rotatable in In order to confine the suction to theperforations in the portion of the drum in contact with the paper aseries of slots 21 are cut in the stationary pipe 12 the length of eachof the slot-s in the embodiment illustrated being such that suction maybe simultaneously effected through five perforations. This mabe variedhowever, to'suit requirements. ach Slot is divided by a brid e 22 whichserves as a brace. A number o circumferential series of perforations 23are formed in the valvular pipe 15 and the perforations of each seriesare adapted to successively register with one of the slots 21 as thedrum rotates. From each series of perforations in pipe 15 a plurality ofpipes 24 radiate in the form of a spider, the outer ends of the pipesbeing screwed into the perforations 3 in the drum. These pipes 24 whileeffecting communication between the valvular mechanism and theperforations 3 also act as spokes uniting the valvular pipe 15 to thedrum so that both rotate as one.

The invention may be embodied with equally advantageous results in themodified form illustrated in a companion application filed Apr. 3, 1920,under Serial 371,059 in which the valvular mechanism is locatedeXteriorly and at one end of the drum and controls a series oflongitudinal pipes located within the drum.

Operation.

As the drum rotates carrying with it the paper to be dried the suctiondevice having been set in motion, it carries with it the valvular pipel5 and radial pipes 24 the pipe 12 remaining stationary. The latterbeing connected to the suction device a vacuum is maintained within itso that as each perforation 23 registers with its respective slot 21suction will take place through the perforation in the drum to which itis connected by pipe 24, causing the paper to adhere to the drum. Thepoint at which suction takes place should occur immediately before thepaper goes on the drum. This suction continues until the perforation hasreached the opposite end of the slot 21 at which point it is cut off bythe solid wall of the pipe 12. The valvular members should be soadjusted that the paper will leave the drum just before the perforationreaches the end of the slot.

What I claim is as follows:

1. In paper making machinery the combination with a hollow drum fordrying paper and the like; saiddrum having an inlet for admitting aheating medium to the interior thereof, of suction means for retainingthe paper 1n position on the drum during travel on the peripherythereof.

2. In paper making machinery the combination with a hollow perforateddrum for drying paper and the like, said drum having an inlet foradmitting a heating medium to the interior thereof, and means forcausingsuction through said perforations 'for the purpose of retaining thepaper in position on the drum during travel on the periphery thereof.

` 3. In paper making machinery-the combination with a hollow perforateddrum for drying paper and the like; said drum having an inlet foradmitting a heating medium to the interior thereof; of means for causingsuctionl through said perforations for the purpose of maintaining thepaper in position on the drum during travel on the periphery thereof,said means consisting of a suction device, and valve controlled meanseffecting communication between the perforations and said device,whereby the suction is confined to the perforations in the portion ofthe drum with which the paper is in contact.

4. In paper making machinery the combination with a hollow perforateddrum for drying paper and the like said drum having an inlet foradmitting a heating medium to the interior thereof; of means for causingsuction through said perforations, said means consisting of asuctiondevice, means effecting communication between the device4 andsaid perforations, and valvular means for controlling the communication,said last mentioned means consisting of a stationary valvular member anda second valvular member rotatable in unison with the drum and coactingwith said stationary member.

5. In paper making machinery the combination with a hollow perforateddrum for drying paper and the like said drum having an inlet foradmitting a heating medium to the interior thereof; of means for causingsuction through said perforations, said means consisting of a suctiondevice, a stationary pipe connected to the suction device and extendinglongitudinally of the drum and having a plurality of spacedcircumferential slots, a second pipe rotatable in unison with the drumand encircling said stationary pipe, the second pipe having a pluralityof circumferential series of perforations therein each series being inthe circumferential plane of one of the slots and adapted to registertherewith, and radial pipes effecting communication between theperforations in the second and the perforationsin the drum.

6. ln paper making machinery a cylindrical drum for drying paper and thelike, said drum being hollow to provide a heating chamber and aconductor extending through the said chamber and having no communicationtherewith, said conductor including a plurality of intakes communicatingwith the outer atmosphere through the periphery of the drum and meansfor causing suction through said conductor for the purpose of retainingthe paper in position upon the 10 drum during travel therein.

In testimony whereof l have signed my name to this specification in thepresence of two witnesses HENRY H. VAUGHAN.

Witnesses:

GORDON G. COOKE, WILLIAM J. C. HnwiarsoN.

